“3ff53e062282ee6ec0906c07191b952dafa0a580”上不存在“doc/v2/howto/cluster/cmd_argument_cn.md”
* Fix bug in MergeModel.cpp. * Add a c-api inferface to initilize the thread environment of Paddle and add a GPU example. * Add some note for paddle_init_thread and move the inplementation of paddle_error_string into a .cpp file. * Add some comments.